1. A 'tab' (small square) of paper soaked in LSD acid.
2. A hard, long-distance march done with kit. Common in the Army and especially British SAS.
3. The place in Australia to bet. Totaliser Agency Board (TAB). Similar to Off Track Betting (OTB), but handle's sports betting aswell.

1. "You got any tab's left."
2. "We've still got a longtime left on this tab."
3. "Let's go to the TAB and lay down a few bets."